Hoisting mechanism



Sept 17, 1935 vA c. ROWLEY l2,014,910

HOI STING MECHANISM Filed Aug. 29, 1934 5 Sheets-Sheet l @pb l?, 1935.v. c. ROWLEY www@ HOISTING MECHANISM Filed Aug. 29, 1934 5 Sheets-Sheet2 twv?.

Wav Maw@ @m1111935 vc, RQWLEY www I HOISTING MECHANISM Filed Aug. 29,1954 3 Sheets-Sheet 5 Patented Sept. 17, 1935 UNITED STATES PATENTOFFICE HOISTING MECHANISM Van 0. Rowley, Pawtucket, R.. I.

Application August 29, 1934, Serial No. 741,963

8 Claims.

My present invention relates to improvements in hoisting mechanism, andhas reference to devices of this character particularly adapted to beused with trucks, tractors, and other movable supports.

Automobile trucks, tractors, and the like have heretofore been equippedwith fixed cranes and derrcks which have the usual swinging booms andreversing lifting mechanism. These hoisting apparatus are usually partof the truck or tractor, and do not include a complete operativemechanism independent of its support. It is the principal object of myinvention to provide a complete hoisting mechanism which may be readilysecured to any support, whether movable or fixed, and which may bedismantled and remounted if desired.

The standard types of truck and tractor hoisty ing equipment have beenXed with respect to the movable support, and have depended upon movementof the truck or tractor to assist the movements of the boom. It is afurther object of my invention to provide a simple and inexpensiveapparatus for power swinging the boom to any desired angle relative tothe boom support, whereby a more exact lifting and setting control isobtained.

With the above and other objects and ad- .,vantageous features in Viewmy invention consists of a novel arrangement of parts more fullydis-closed in the detailed description following, in conjunction with4the accompanying drawings, and more specifically defined in the appendedU claims. In the drawings:

Fig. 1 is a side elevation of the novel hoisting mechanism, as mountedon a truck, parts being broken away;

Fig. 2 is a plan View thereof, parts being bro-ken away;

Fig. 3 is a front sectional elevation of the novel power swingingmechanism, taken on the line 3 3 of Fig. 2

Fig. 4 is a vertical sectional View taken on the 'line 4-4 of Fig. 2;and f Fig. 5 is a side elevation, parts being in section, of a preferredarrangement of standard reversing mechanism used in connection With thelswinging mechanism.

I have found it advisable to provide a complete, self contained hoistingmechanism which may be readily mounted on any support, but which isparticularly suitable for movable supports such as trucks and tractors.The parts are readily locked to the truck or tractor, and in- CTI cludea novel arrangement whereby the boom may be power swung horizontally,thus providing a universal type hoisting mechanism in compact portableform. This novel mechanism consists of a threaded jack shaft on which asleeve is 5 power reciprocated, the sleeve being operatively connectedto the boom so as to produce a corresponding swinging movement of theboom. I have also provided stop mechanism for limiting the powermovement, to take care of possible 10 inattentiveness on the part of theoperators.

A preferred constructional arrangement of the parts is illustrated inthe accompanying drawings, in which the truck body is indicated byreference character II), and the self-contained hoist- 15 ing unit isdesignated I I. As best shown in Fig.

l, the hoisting unit includes an engine I2,preferably of the gasolinetype, and two hoisting drums I3, I4 for the two cables I5, I6, with theusual clutch mechanisms I"I and I5 therefor, and 20 the usual brakecontrols I9 and 29, the drums being power operated through a sprocketand chain mechanism 2l.

A frame 25 is provided to support the boom, the frame comprisingtwosubstantially vertical 25 compression supports 26 and two tensionsupports 2'I, the supports being respectively hingedly connected attheir lower ends to mountings 29 bolted to the truck frame at thecorners thereof, as shown in Fig. 2, and being locked together 30 attheir upper extremities by a through bolt 39, see Fig. l.

The two cables I5, `II pass through a block 32 which is pivotallysecured to a mounting 33 secured to and between the supports 25, and 35through a second block 34 which is pivoted on the through bolt 39; thecable I5 has an eye 36 at its end, fastened to an end yoke 3l hinged tothe boom 38, and the cable I6 passes through a set of sheaves 39 hookedas at 40 over a suitable pivot 40 at the end of the boom, and carrying ahoisting hook 43. The boom 38 is preferably tubular, and has end caps44, 45, the end cap 44 carrying a cross bar 41 to function as a pivotalsupport for the hook 40 and the yoke 3l, and the end cap 45 45 beingpivoted to a support block or lugs 49, see Fig. 4.

Referring now to Fig. 4, the block 49 is mounted on a turntable plate5I, which has a central hub 52, a turntable support 53 being bolted to50 the truck frame and having an upstanding cylindrical lng 54 seated inthe central hub and serving as a turning pivot for the turntable plate.A swing bar 55 is provided with an end block 51 which is. diametricallyopposite the block 49, 55

locked to the turntable plate, as by welding, whereby swinging movementof the bar 55 turns the turntable plate and swings the boom.

As best illustrated in Fig. 2, a sprocket wheel 59 is keyed to the endof the shaft 60 of the hoisting drum I3, and a reV-ersing mechanism 6|,of any standard type, is driven from the wheel 59, as by a chain 62 anda sprocket wheel 63 mounted on the gear shaft B5. The reversingmechanism is manually controlled by a shift lever 68 through a link S9,an arm 18, and a shaft 1|, and drives a threaded jack shaft I through asprocket 16, chain ll, and a sprocket wheel 18. The jack shaft isrotatably supported in spaced brackets 8i? bolted to the truck frame,and has a threaded collar 82, see Figs. 3 and 4, mounted thereon forreciprocating movement, the collar having a circular recess 83 at theupper end in which a depending lug 84 of a rod support block 85 ispivoted, the block having a horizontal bore 86 through which the rod orswing bar 55 may slide.

The end sections of the jack shaft are left smooth as indicated at 81,see Fig. 2, to serve as limit stops, wh-ereby continued rotation of thejack shaft brings the sleeve to the smooth sections and thus stopsfurther swinging movement of the boom.

Any type of standard reversing mechanism may be used; the preferredtype, see Fig. 5, includes an arrangement such as described in U. S.Patent No, 1,942,318, granted January 2, 1934, which shows a multipledisk clutch t9, which is locked together by clutch fingers 90 when theoperating lever 68 is thrown to forward position to lock the wholereverse gear as a solid coupling. The reverse drive is obtained byclamping the brake band 9| around the outside drum or casing 92, whichcarries the pinion gears, the drive being through the pinion gears andthe outside drum. When the control lever is in neutral position, thedisks and the brake band` are free and the gears run idle.

The construction and the operation of the novel hoisting mechanism isnow clear. The mechanism includes a small engine, hoisting drums, a boomwith a support. frame and a turntable, and a jack shaft which is poweroperated to swing the boom, all these parts being bolted to a truck bodyor other suitable support. The entire mechanism may therefore be readilyinstalled and demounted if desired, and has a small number of rugged,sturdy, operating parts which have long life but which may be readilyrepaired and replaced if broken. If desired, the mechanism may be drivenfrom the truck or tractor engine, by using a standard type suitablereduction gear arrangement.

The mechanism being mounted, the vertical movement of the boom and thehousing cable are controlled by the operator in the usual manner; thejack shaft may be set in operation as desired, to suitably swing theboom before, during, or after the hoisting and setting operations, theend sections limiting the extent of the power swing.

It is thus evident that the improved hoisting mechanism has a minimumnumber of parts, is relatively inexpensive to manufacture and toassemble, is readily installed, repaired, and dismounted, and affords auniversal portable hoist- `ing arrangement which facilitates thehoisting and the setting operations.

While I have described a preferred constructional embodiment of myinvention, it is clear that desired changes in the relative arrangementof the parts, in their size, and in their operation may be made to suitthe requirements for different installations, within the spirit and thescope of the invention as defined in the appended claims. 5

I claim:

1. In a hoisting mechanism, a rotatable boom support, a boom pivotallysecured thereto, a thread-ed jack shaft, means for rotating said jackshaft, a threaded collar` member engaging said l0 jack shaft, and amember connected to said boom support and slidably seated in said collarmember.

2. In a hoisting mechanism, a rotatable boom support, a boom pivotallysecured thereto, a threaded jack shaft, means for rotating said jackshaft, a threaded collar engaging said jack shaft,

a support rotatably mounted on said collar, and a bar connected to saidboom support and slidably seated in said collar support.

3. In a hoisting mechanism, a turntable support, a turntable rotatablymounted thereon, a boom pivotally mounted on said turntable, a threadedjack shaft, reversible power means for rotating said jack shaft, athreaded collar on said jack shaft, a support block swingably mounted onsaid collar, and a swing bar connected to said turntable and slidablyseated in said support block.

4. In a hoisting mechanism, a turntable support, a turntable rotatablymounted thereon, a boom pivotally mounted on said turntable, a threadedjack shaft, reversible power means for rotating said jack shaft, athreaded collar on said jack shaft, a support block swingably mounted onsaid collar, and a swing bar connected to said turntable and slidablyseated in said support block, said jack shaft having smooth end portionsto limit outward movement of said collar.

5. In a hoisting mechanism, a turntable support, a turntable rotatablymounted thereon, a boom pivotally mounted on said turntable, a threadedjack shaft, reversible power means for rotating said jack shaft, athreaded collar on said jack shaft, a support block swingably mounted onsaid collar and having a bore, and a swing bar connected to saidturntable and slidably extending through the bore of said support block.

6. In a hoisting mechanism, a turntable support having an upstandingcylindrical lug, a turntable having a hub rotatably mounted on said lug,a boom pivotally mounted on said turntable,

a threaded jack shaft, reversible power means for rotating said jackshaft, a threaded collar on said jack shaft, a support block swingablymounted on said collar, and a swing bar connected to said turntable andslidably seated ir said support block.

7. In a hoisting mechanism, a rotatable boom support, a boom pivotallysecured thereto, a threaded jack shaft, means for rotating said jackshaft, a threaded collar member having a bore therethrough and engagingsaid jack shaft, and a member connected to said boom support andslidably extending through the bore of said collar member.

8. In a hoisting mechanism, a rotatable boom support, a boom pivotallysecured thereto, a threaded jack shaft, means for rotating said jackshaft, a threaded collar engaging said jack shaft, a support rotatablymounted on said collar and having a bore therethrough, and a barconnected to said boom support and slidably extending through the boreof said collar support.

VAN C. ROWLEY.

